21741115921 has 32 divisors (see below), whose sum is σ = 27102310400. Its totient is φ = 17025240960.

The previous prime is 21741115901. The next prime is 21741115931. The reversal of 21741115921 is 12951114712.

It is a de Polignac number, because none of the positive numbers 2^k-21741115921 is a prime.

It is a super-2 number, since 2×21741115921² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21741115901) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 427741 + ... + 475861.

It is an arithmetic number, because the mean of its divisors is an integer number (846947200).

Almost surely, 2^21741115921 is an apocalyptic number.

It is an amenable number.

21741115921 is a deficient number, since it is larger than the sum of its proper divisors (5361194479).

21741115921 is a wasteful number, since it uses less digits than its factorization.

21741115921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48269.

The product of its digits is 5040, while the sum is 34.

It can be divided in two parts, 217411 and 15921, that added together give a palindrome (233332).

The spelling of 21741115921 in words is "twenty-one billion, seven hundred forty-one million, one hundred fifteen thousand, nine hundred twenty-one".